RSI

RSI may refer to:

Business

• RADARSAT International, a subsidiary of MacDonald Dettwiler and Associates
• Resin Systems Inc., a Canadian company that develops, manufactures, and sells composite products
• Relative strength index, a technical indicator used in the analysis of financial markets
• RSI Corporation, RadioFrequency Safety International, a safety firm specializing in OSHA/FCC radio frequency (RF) compliance
• Relational Semantics, Inc, a U.S. software company specializing in case management systems for state judiciaries

Science and technology

• RSI register, a 64-bit processor register of x86 CPUs
• Records Series Identifiers, a method used in records management for applying retention and follow-up information for electronic documents
• Review of Scientific Instruments, a scientific journal
• Repetitive strain injury, a disorder affecting muscles, tendons and nerves from repetitive movements, forceful exertions, vibrations, mechanical compression, or sustained/awkward positions.
• Research Science Institute, a summer research program held at MIT for rising high-school seniors
• R-value Système International, a measure of thermal resistance in SI units, see R-value (insulation)
• Register Storage Immediate, a processor register available in some assembly languages
• The Real, The Symbolic, and The Imaginary, a theory in Lacanian psychoanalysis concerning human perception of reality
• Regional Snowfall Index - a system used by NOAA to assess the impact of winter storms in the United States
• Rapid sequence induction, a method of emergency incubation, involving paralytics and sedation.

Government and society

• Radio Slovenia International, international service of Slovenian state radio on shortwave and via satellite
• Radio Singapore International, a news agency in Singapore
• Radiotelevisione svizzera di lingua italiana, a Swiss radio and television broadcaster
• Red Sports International (1931–1937), communist sports federation
• Revenue and Social Insurance number, an identifier used for tax and welfare purposes in the Republic of Ireland
• Italian Social Republic or Repubblica Sociale Italiana, a puppet state of Nazi Germany during the later part of World War II
• Robotics Society of India, an academic society aimed at promoting Indian robotics and automation activities
• Required supplementary information, evaluations of governmental accounting

Arts and culture

• Radio Svizzera Italiana, a Swiss public broadcasting organisation
• Religious Science International, a group of Religious Science churches
• Residual self image, in psychology the concept that individuals tend to think of themselves as projecting a certain physical appearance
• Rishi (IAST: ṛṣi), a Hindu saint or sage